Entomological mission to the Okomu plantation in Nigeria, from 21st to 27th May 1991
Whilst female inflorescence pests do exist at the Okomu plantation, their populations vary enormously from one plot to the next. Hence, they are not solely responsible for the sharp fall in the extraction rate in the second halves of the last three years. Pollinating insect populations are well represented with good pollinating species: #E. kamerunicus#, #E. singularia# and #E. plagiatus#. The other causes of the drop in extraction rate could be the following: -more or less sizeable oil losses in the 88 to 90 sludges, -non-detached fruits not recovered after sterilization, -ripe bunches are not always harvested. It is not rare to see rotting bunches on the oil palms, - the dry period affects the fruit-set rate on female inflorescences. In rainy periods, frequent heavy rainfall hinders collection of detached fruits, which are more numerous as the bunches ripen more quickly. Rainwater may also falsify the weight of the bunch transporter trailers. A list of other, equally important entomological problems is given at the end of the report. It is essential for the Okomu plantation to set up a rational phytosanitary surveillance and chemical treatment network.
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| Format: | monograph biblioteca |
| Language: | eng |
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CIRAD-IRHO
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| Subjects: | H10 - Ravageurs des plantes, F63 - Physiologie végétale - Reproduction, L20 - Écologie animale, |
| Online Access: | http://agritrop.cirad.fr/581075/ http://agritrop.cirad.fr/581075/1/Philippe_IRHO_mission_1991_ENG.pdf |
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